The exact survival rate of 34-week preterm infants is unknown, but most of them survive, with a small percentage developing a series of complications that lead to death. Most 34-week preterm infants have nearly perfect organ development, but not perfect maturity, especially the respiratory system and immune system. 1. Respiratory system: Before the birth of preterm infants less than 35 weeks, pregnant women can be given dexamethasone to promote the maturation of the fetal lungs, to prevent the emergence of neonatal respiratory distress syndrome, leading to respiratory distress in preterm infants, or even death. 2. Immune system: After birth, the baby needs to be fed in a warm box to prevent excessive exposure, which can lead to preterm infection, preterm infectious shock and even death. In addition, a series of treatments can be used to reduce the occurrence of complications, such as prolonged umbilical cord disconnection after birth of preterm infants, reduce the incidence of blood transfusion in preterm infants. The probability of survival of preterm infants after birth is also related to the condition of the preterm infant’s development at the time of its unbirth, and the presence of complications in the mother, among other factors.